Mercurial > hg > CbC > CbC_gcc
annotate zlib/contrib/asm586/match.S @ 51:ae3a4bfb450b
add some files of version 4.4.3 that have been forgotten.
author | kent <kent@cr.ie.u-ryukyu.ac.jp> |
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date | Sun, 07 Feb 2010 18:27:48 +0900 |
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1 /* match.s -- Pentium-optimized version of longest_match() |
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2 * Written for zlib 1.1.2 |
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3 * Copyright (C) 1998 Brian Raiter <breadbox@muppetlabs.com> |
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4 * |
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5 * This is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License. |
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7 */ |
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8 |
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9 #ifndef NO_UNDERLINE |
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10 #define match_init _match_init |
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11 #define longest_match _longest_match |
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12 #endif |
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13 |
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14 #define MAX_MATCH (258) |
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15 #define MIN_MATCH (3) |
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16 #define MIN_LOOKAHEAD (MAX_MATCH + MIN_MATCH + 1) |
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17 #define MAX_MATCH_8 ((MAX_MATCH + 7) & ~7) |
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18 |
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19 /* stack frame offsets */ |
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20 |
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21 #define wmask 0 /* local copy of s->wmask */ |
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22 #define window 4 /* local copy of s->window */ |
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23 #define windowbestlen 8 /* s->window + bestlen */ |
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24 #define chainlenscanend 12 /* high word: current chain len */ |
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25 /* low word: last bytes sought */ |
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26 #define scanstart 16 /* first two bytes of string */ |
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27 #define scanalign 20 /* dword-misalignment of string */ |
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28 #define nicematch 24 /* a good enough match size */ |
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29 #define bestlen 28 /* size of best match so far */ |
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30 #define scan 32 /* ptr to string wanting match */ |
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31 |
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32 #define LocalVarsSize (36) |
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33 /* saved ebx 36 */ |
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34 /* saved edi 40 */ |
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35 /* saved esi 44 */ |
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36 /* saved ebp 48 */ |
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37 /* return address 52 */ |
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38 #define deflatestate 56 /* the function arguments */ |
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39 #define curmatch 60 |
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40 |
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41 /* Offsets for fields in the deflate_state structure. These numbers |
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42 * are calculated from the definition of deflate_state, with the |
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43 * assumption that the compiler will dword-align the fields. (Thus, |
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44 * changing the definition of deflate_state could easily cause this |
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45 * program to crash horribly, without so much as a warning at |
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46 * compile time. Sigh.) |
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47 */ |
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48 |
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49 /* All the +zlib1222add offsets are due to the addition of fields |
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50 * in zlib in the deflate_state structure since the asm code was first written |
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51 * (if you compile with zlib 1.0.4 or older, use "zlib1222add equ (-4)"). |
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52 * (if you compile with zlib between 1.0.5 and 1.2.2.1, use "zlib1222add equ 0"). |
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53 * if you compile with zlib 1.2.2.2 or later , use "zlib1222add equ 8"). |
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54 */ |
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55 |
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56 #define zlib1222add (8) |
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57 |
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58 #define dsWSize (36+zlib1222add) |
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59 #define dsWMask (44+zlib1222add) |
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60 #define dsWindow (48+zlib1222add) |
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61 #define dsPrev (56+zlib1222add) |
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62 #define dsMatchLen (88+zlib1222add) |
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63 #define dsPrevMatch (92+zlib1222add) |
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64 #define dsStrStart (100+zlib1222add) |
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65 #define dsMatchStart (104+zlib1222add) |
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66 #define dsLookahead (108+zlib1222add) |
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67 #define dsPrevLen (112+zlib1222add) |
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68 #define dsMaxChainLen (116+zlib1222add) |
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69 #define dsGoodMatch (132+zlib1222add) |
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70 #define dsNiceMatch (136+zlib1222add) |
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71 |
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72 |
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73 .file "match.S" |
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74 |
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75 .globl match_init, longest_match |
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76 |
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77 .text |
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78 |
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79 /* uInt longest_match(deflate_state *deflatestate, IPos curmatch) */ |
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80 |
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81 longest_match: |
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82 |
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83 /* Save registers that the compiler may be using, and adjust %esp to */ |
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84 /* make room for our stack frame. */ |
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85 |
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86 pushl %ebp |
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87 pushl %edi |
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88 pushl %esi |
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89 pushl %ebx |
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90 subl $LocalVarsSize, %esp |
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91 |
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92 /* Retrieve the function arguments. %ecx will hold cur_match */ |
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93 /* throughout the entire function. %edx will hold the pointer to the */ |
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94 /* deflate_state structure during the function's setup (before */ |
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95 /* entering the main loop). */ |
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96 |
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97 movl deflatestate(%esp), %edx |
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98 movl curmatch(%esp), %ecx |
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99 |
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100 /* if ((uInt)nice_match > s->lookahead) nice_match = s->lookahead; */ |
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101 |
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102 movl dsNiceMatch(%edx), %eax |
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103 movl dsLookahead(%edx), %ebx |
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104 cmpl %eax, %ebx |
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105 jl LookaheadLess |
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106 movl %eax, %ebx |
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107 LookaheadLess: movl %ebx, nicematch(%esp) |
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108 |
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109 /* register Bytef *scan = s->window + s->strstart; */ |
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110 |
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111 movl dsWindow(%edx), %esi |
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112 movl %esi, window(%esp) |
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113 movl dsStrStart(%edx), %ebp |
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114 lea (%esi,%ebp), %edi |
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115 movl %edi, scan(%esp) |
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116 |
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117 /* Determine how many bytes the scan ptr is off from being */ |
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118 /* dword-aligned. */ |
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119 |
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120 movl %edi, %eax |
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121 negl %eax |
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122 andl $3, %eax |
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123 movl %eax, scanalign(%esp) |
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124 |
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125 /* IPos limit = s->strstart > (IPos)MAX_DIST(s) ? */ |
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126 /* s->strstart - (IPos)MAX_DIST(s) : NIL; */ |
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127 |
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128 movl dsWSize(%edx), %eax |
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129 subl $MIN_LOOKAHEAD, %eax |
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130 subl %eax, %ebp |
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131 jg LimitPositive |
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132 xorl %ebp, %ebp |
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133 LimitPositive: |
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134 |
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135 /* unsigned chain_length = s->max_chain_length; */ |
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136 /* if (s->prev_length >= s->good_match) { */ |
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137 /* chain_length >>= 2; */ |
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138 /* } */ |
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139 |
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140 movl dsPrevLen(%edx), %eax |
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141 movl dsGoodMatch(%edx), %ebx |
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142 cmpl %ebx, %eax |
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143 movl dsMaxChainLen(%edx), %ebx |
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144 jl LastMatchGood |
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145 shrl $2, %ebx |
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146 LastMatchGood: |
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147 |
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148 /* chainlen is decremented once beforehand so that the function can */ |
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149 /* use the sign flag instead of the zero flag for the exit test. */ |
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150 /* It is then shifted into the high word, to make room for the scanend */ |
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151 /* scanend value, which it will always accompany. */ |
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152 |
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153 decl %ebx |
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154 shll $16, %ebx |
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155 |
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156 /* int best_len = s->prev_length; */ |
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157 |
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158 movl dsPrevLen(%edx), %eax |
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159 movl %eax, bestlen(%esp) |
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160 |
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161 /* Store the sum of s->window + best_len in %esi locally, and in %esi. */ |
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162 |
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163 addl %eax, %esi |
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164 movl %esi, windowbestlen(%esp) |
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165 |
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166 /* register ush scan_start = *(ushf*)scan; */ |
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167 /* register ush scan_end = *(ushf*)(scan+best_len-1); */ |
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168 |
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169 movw (%edi), %bx |
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170 movw %bx, scanstart(%esp) |
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171 movw -1(%edi,%eax), %bx |
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172 movl %ebx, chainlenscanend(%esp) |
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173 |
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174 /* Posf *prev = s->prev; */ |
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175 /* uInt wmask = s->w_mask; */ |
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176 |
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177 movl dsPrev(%edx), %edi |
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178 movl dsWMask(%edx), %edx |
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179 mov %edx, wmask(%esp) |
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180 |
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181 /* Jump into the main loop. */ |
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182 |
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183 jmp LoopEntry |
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184 |
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185 .balign 16 |
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186 |
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187 /* do { |
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188 * match = s->window + cur_match; |
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189 * if (*(ushf*)(match+best_len-1) != scan_end || |
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190 * *(ushf*)match != scan_start) continue; |
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191 * [...] |
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192 * } while ((cur_match = prev[cur_match & wmask]) > limit |
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193 * && --chain_length != 0); |
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194 * |
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195 * Here is the inner loop of the function. The function will spend the |
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196 * majority of its time in this loop, and majority of that time will |
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197 * be spent in the first ten instructions. |
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198 * |
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199 * Within this loop: |
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200 * %ebx = chainlenscanend - i.e., ((chainlen << 16) | scanend) |
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201 * %ecx = curmatch |
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202 * %edx = curmatch & wmask |
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203 * %esi = windowbestlen - i.e., (window + bestlen) |
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204 * %edi = prev |
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205 * %ebp = limit |
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206 * |
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207 * Two optimization notes on the choice of instructions: |
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208 * |
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209 * The first instruction uses a 16-bit address, which costs an extra, |
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210 * unpairable cycle. This is cheaper than doing a 32-bit access and |
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211 * zeroing the high word, due to the 3-cycle misalignment penalty which |
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212 * would occur half the time. This also turns out to be cheaper than |
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213 * doing two separate 8-bit accesses, as the memory is so rarely in the |
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214 * L1 cache. |
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215 * |
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216 * The window buffer, however, apparently spends a lot of time in the |
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217 * cache, and so it is faster to retrieve the word at the end of the |
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218 * match string with two 8-bit loads. The instructions that test the |
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219 * word at the beginning of the match string, however, are executed |
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220 * much less frequently, and there it was cheaper to use 16-bit |
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221 * instructions, which avoided the necessity of saving off and |
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222 * subsequently reloading one of the other registers. |
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223 */ |
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224 LookupLoop: |
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225 /* 1 U & V */ |
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226 movw (%edi,%edx,2), %cx /* 2 U pipe */ |
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227 movl wmask(%esp), %edx /* 2 V pipe */ |
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228 cmpl %ebp, %ecx /* 3 U pipe */ |
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229 jbe LeaveNow /* 3 V pipe */ |
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230 subl $0x00010000, %ebx /* 4 U pipe */ |
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231 js LeaveNow /* 4 V pipe */ |
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232 LoopEntry: movb -1(%esi,%ecx), %al /* 5 U pipe */ |
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233 andl %ecx, %edx /* 5 V pipe */ |
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234 cmpb %bl, %al /* 6 U pipe */ |
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235 jnz LookupLoop /* 6 V pipe */ |
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236 movb (%esi,%ecx), %ah |
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237 cmpb %bh, %ah |
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238 jnz LookupLoop |
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239 movl window(%esp), %eax |
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240 movw (%eax,%ecx), %ax |
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241 cmpw scanstart(%esp), %ax |
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242 jnz LookupLoop |
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243 |
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244 /* Store the current value of chainlen. */ |
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245 |
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246 movl %ebx, chainlenscanend(%esp) |
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247 |
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248 /* Point %edi to the string under scrutiny, and %esi to the string we */ |
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249 /* are hoping to match it up with. In actuality, %esi and %edi are */ |
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250 /* both pointed (MAX_MATCH_8 - scanalign) bytes ahead, and %edx is */ |
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251 /* initialized to -(MAX_MATCH_8 - scanalign). */ |
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252 |
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253 movl window(%esp), %esi |
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254 movl scan(%esp), %edi |
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255 addl %ecx, %esi |
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256 movl scanalign(%esp), %eax |
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257 movl $(-MAX_MATCH_8), %edx |
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258 lea MAX_MATCH_8(%edi,%eax), %edi |
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259 lea MAX_MATCH_8(%esi,%eax), %esi |
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260 |
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261 /* Test the strings for equality, 8 bytes at a time. At the end, |
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262 * adjust %edx so that it is offset to the exact byte that mismatched. |
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263 * |
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264 * We already know at this point that the first three bytes of the |
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265 * strings match each other, and they can be safely passed over before |
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266 * starting the compare loop. So what this code does is skip over 0-3 |
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267 * bytes, as much as necessary in order to dword-align the %edi |
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268 * pointer. (%esi will still be misaligned three times out of four.) |
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269 * |
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270 * It should be confessed that this loop usually does not represent |
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271 * much of the total running time. Replacing it with a more |
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272 * straightforward "rep cmpsb" would not drastically degrade |
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273 * performance. |
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274 */ |
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275 LoopCmps: |
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276 movl (%esi,%edx), %eax |
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277 movl (%edi,%edx), %ebx |
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278 xorl %ebx, %eax |
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279 jnz LeaveLoopCmps |
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280 movl 4(%esi,%edx), %eax |
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281 movl 4(%edi,%edx), %ebx |
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282 xorl %ebx, %eax |
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283 jnz LeaveLoopCmps4 |
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284 addl $8, %edx |
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285 jnz LoopCmps |
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286 jmp LenMaximum |
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287 LeaveLoopCmps4: addl $4, %edx |
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288 LeaveLoopCmps: testl $0x0000FFFF, %eax |
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289 jnz LenLower |
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290 addl $2, %edx |
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291 shrl $16, %eax |
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292 LenLower: subb $1, %al |
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293 adcl $0, %edx |
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294 |
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295 /* Calculate the length of the match. If it is longer than MAX_MATCH, */ |
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296 /* then automatically accept it as the best possible match and leave. */ |
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297 |
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298 lea (%edi,%edx), %eax |
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299 movl scan(%esp), %edi |
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300 subl %edi, %eax |
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301 cmpl $MAX_MATCH, %eax |
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302 jge LenMaximum |
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303 |
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304 /* If the length of the match is not longer than the best match we */ |
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305 /* have so far, then forget it and return to the lookup loop. */ |
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306 |
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307 movl deflatestate(%esp), %edx |
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308 movl bestlen(%esp), %ebx |
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309 cmpl %ebx, %eax |
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310 jg LongerMatch |
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311 movl chainlenscanend(%esp), %ebx |
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312 movl windowbestlen(%esp), %esi |
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313 movl dsPrev(%edx), %edi |
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314 movl wmask(%esp), %edx |
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315 andl %ecx, %edx |
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316 jmp LookupLoop |
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317 |
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318 /* s->match_start = cur_match; */ |
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319 /* best_len = len; */ |
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320 /* if (len >= nice_match) break; */ |
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321 /* scan_end = *(ushf*)(scan+best_len-1); */ |
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322 |
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323 LongerMatch: movl nicematch(%esp), %ebx |
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324 movl %eax, bestlen(%esp) |
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325 movl %ecx, dsMatchStart(%edx) |
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326 cmpl %ebx, %eax |
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327 jge LeaveNow |
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328 movl window(%esp), %esi |
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329 addl %eax, %esi |
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330 movl %esi, windowbestlen(%esp) |
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331 movl chainlenscanend(%esp), %ebx |
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332 movw -1(%edi,%eax), %bx |
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333 movl dsPrev(%edx), %edi |
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334 movl %ebx, chainlenscanend(%esp) |
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335 movl wmask(%esp), %edx |
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336 andl %ecx, %edx |
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337 jmp LookupLoop |
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338 |
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339 /* Accept the current string, with the maximum possible length. */ |
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340 |
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341 LenMaximum: movl deflatestate(%esp), %edx |
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342 movl $MAX_MATCH, bestlen(%esp) |
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343 movl %ecx, dsMatchStart(%edx) |
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344 |
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345 /* if ((uInt)best_len <= s->lookahead) return (uInt)best_len; */ |
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346 /* return s->lookahead; */ |
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347 |
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348 LeaveNow: |
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349 movl deflatestate(%esp), %edx |
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350 movl bestlen(%esp), %ebx |
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351 movl dsLookahead(%edx), %eax |
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352 cmpl %eax, %ebx |
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353 jg LookaheadRet |
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354 movl %ebx, %eax |
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355 LookaheadRet: |
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356 |
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357 /* Restore the stack and return from whence we came. */ |
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358 |
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359 addl $LocalVarsSize, %esp |
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360 popl %ebx |
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361 popl %esi |
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362 popl %edi |
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363 popl %ebp |
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364 match_init: ret |